This power control from a 1968 Motorola manual shows how to use a contemporary diac as a zero-crossing detector. The SCR is of the type depending on the power of the load.
The slope of an object causes the sensor, a mercury switch to be triggered. The circuit activates...
This circuit with 5 times gain was found in European documentation from the 1980s. The input and...
Found in a 90s Linear Technology documentation, this circuit uses an operating system of the time....